linux-kernel - Re: [v4.1.10-rt10][PATCH 0/2] PCI: dra7xx/dwc: fix "WARNING: CPU: 1 PID: 82 at kernel/irq/handle.c:150 handle_irq_event

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Message-ID: <alpine.DEB.2.11.1511032056440.4032@nanos>
Date:	Tue, 3 Nov 2015 21:01:08 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Grygorii Strashko <grygorii.strashko@...com>
cc:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	Sekhar Nori <nsekhar@...com>
Subject: Re: [v4.1.10-rt10][PATCH 0/2] PCI: dra7xx/dwc: fix "WARNING: CPU:
 1 PID: 82 at kernel/irq/handle.c:150 handle_irq_event_percpu"

On Tue, 3 Nov 2015, Grygorii Strashko wrote:
> On 11/03/2015 03:46 PM, Sebastian Andrzej Siewior wrote:
> > On 11/02/2015 08:30 PM, Grygorii Strashko wrote:
> >> On -RT above code will generate warnings, because driver_xx_hw_irq_handler()
> >> will be forced threaded (by default) and, as result, generic_handle_irq()
> >> will be called with IRQs enabled. To W/A this issue generic_handle_irq() can
> >> be surrounded by raw_spin_lock_irqsave/irqrestore(wa_lock).
> > 
> > and what happens without -RT if you boot threadedirqs?
> > 
> 
> Yep. It will still warn :( Can be reworked to cover this case also, i think
> (if overall concept will be accepted) 

wa_lock - I read that "Warning Annihilation Lock" - does not really
qualify as a concept.

Thanks,

	tglx
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